The unpacking/splat operators * and ** differ widely in their applicability across python versions (2.7, 3.x < 3.5 and 3.x >= 3.5).
For example:
| 2.7 | 3.1-3.4 | 3.5
----------------------------------------------------------------------
function(*args) ✓ ✓ ✓
x, *y, z = [1, 2, 3, 4, 5] x ✓ ✓
{**x, **y} x x ✓
Are there any more discrepancies between the various versions that I've missed? I'm looking through PEP and Readmes but the docs aren't detailed with this.